In a gymnasium in Minnesota, a small quadrotor drone flies effortlessly through hoops. But look for its pilot, and it's not obvious who it is, because it's being flown by someone's brain. Scientists at the University of Minnesota have designed and tested the world's first noninvasive, brain-controlled helicopter in a breakthrough that could one day allow people who are paralyzed to operate wheelchairs, robotic arms or electronics using only their minds. The study is described in the Journal of Neural Engineering.